I don't see any 5.56 in that bin. I see mostly 30 cal (30-06 and 7.62) and some 45ACP. All the primers I see look to be bronze colored, which would be right for LC once fired. The one with the silver primer is almost certainly reloaded.
Yeah sometimes its a temporary credit while they investigate. Other times, depending on the card and the amount and perhaps the history of the merchant, it will just be permanent off the bat. They will tell you if its temp.
Sounds like it was clearly misrepresented and defective. File a dispute with your credit card company and make them take it back. Don't just suck it up, that's 2 different grounds for doing a chargeback.